Steam-boiler.



E. F. EDGAR.

STEAM BOILER.

APPLICATION FILED MA1L30, 1909! Patented Sept. 2L 1809.

2 SHEETS-SHEET l.

WITNESSES: (5.23

E. F. EDGAR.

STEAM BOILER.

APPLICATION FILED MAR. so, 1909.

Patented Sept. 21, 1909.

2 SHEETS-SHE$BT 2.

l/VVE/WOR 2/44., 22

my invention. l! 1g. 5 is a sectional siiic ele-' a ville Araceli-tillerUlcer all r w 2r acme r. wcccimrmwm; r

s'rmlwcciiliiie.

l fipecjfication of Letters f m g i @qgggfg (I fiiaplication mm Iaich3e, 19cc. serial esmw.

, draft bail le's located therein. @n we siclc, W11) filial l, E. F;Emmi, citizen fi e airlift are slicwn hanging clown. Tn" nnd resident cfWcccl- There is z'tlie cicicn w e. boiler is vvcrlv e cmzcc g cfMidalleseXa-fil ccoiici' ijlIGI position slnm'n have invented certainflew in ll'cliiecl cpcr position when Siam-Boilers, the 0399 1e ashes miof llac nving is a specification. Water l c I tlircugi clean cutalccrll. igure 1 s a irciit elc iraticn View parfi in Brick arch 5 willprccmce a very high fur 5Q full and part in section cfaboilerembccly'iiig mice iemperaliirc t0 the fire on, the

' rate and in conjunction 'Wli'll' are brick vaticn View 21% line A-B inFig. 1. Fig. lining 18' i0 the eml casings mid bulile walls 3 is anenlz-irgrccl demil section View of one 4, help to maintain the hightemperature tribe cxpzzintlcd in sheet of upper (lrui'n. rcthe gases,until iliey reach the centercf 55 My object in inventii'i'g {hislicil'er is to the upper ccmlmstion chamber over brick.

.15 produce a bciler capable of working at oiie. arch 5, Where theyenter among Water tubes thousand "cmimls pressure or more and cle- 3,and page hick t'c the draft exii becwcen liv y stem; to an cngix'ie'with high bafii e Walls cuter casing 8. VJlule m 11 and a boiler thatwill always these passages of which there are fc u' they 7:;

v v is heating sm-face'a'ml capcare cause-6' in mcvc slowly bymljusl'cble 2! l'rle ct? pa'scrlnc a very high furnace temcirclilialrles24? and by the length cf licfllc PQX'il-UIFQ W11 1 escaping gases ebmiflthe W's ills 4c given clislancc of travel sullicicni; fiemperzrim'c ofthe steam and a boiler of long to 'ccci them rlcwn to the temperature oflife 21ml little repairs. The construction and l ke Water in the Watertubes and :is' tliey value of these fcatnres I will hereafter e'xcoolthey drop to the bottom cf the section 25 plain. amo iglhe tubes analpass out into uplake Deals' of c0ncfirucii0m-h Water* and 10 untleradjustable draft baffle 24:. The steam drum, 2, Wflil and mud drum, 3,Waescaping nmler these adjustable clra'ft filer lJYIbQS, hbnill'e will,5', brick arch, 6, non-' bellies 241 w i l be in this boiler abcut- 5%8G combustible protection cc bottom of upper (legrees Rl'ilQIllil8ll3which the temperature drum, 7,1rcc-ccmbustihle protection of lower ofthe S7 armat cm thousand poumls pres-- drum, lig'lii brick covering onoutsifie of sure. z eins lxigl: but not when taking vute'r tubes 3, U,asbestos outsidecovering, in'lc con 'JTZKU'GH the economy (lGllVGil l);

10. u alakesl containing acl' nslable draft half ,the engine at timepressurc and the inrnacc 7 L, 5

fies clean out door and draft exit, 11, clean temperefure which shouldbe liwenty five out clccr, 12, inrnuc (10613 13, ash pit door; limiclrcdclegrcee Fahrenheitcr :1 lilllc more I l5, arch skew back bricks, 16 i ythe construction of 'tliisfurnncc which 8;; 01' l e \-:itlxilrmval cfwatec tubes 3, will be about five limes the temperance of 17, steam ex",llqlining bricks for cnrl casthe crimping gases: from the uptake which9c mg, l9, (lead air space 20, cast iron or steel difference will give aboiler cfliciency cf ii casing, 21, p-arfiiiicn between (lead air space'lit'ijle over per cent. The waicr is kept and nsbeslos covering,saddles, 23, sad- V on the heating surface of this boiler by the zllctie roclrs, 2' 2 adjustable draft baffles, 2 CiICfllfltlQfi, which iscaused by the healed lr: it cxi''s 26 recesses in tube holes of upgasesentering ihe center of each scclimx .5 per (ll-um. which causes thewater to circulalc npwzinl 5 (FmwmZ flmnrz'pz-icw.llp;)e1drumlwhiclithrough all cf the center tubes cf each inc water and steam drum andlower tion and dc'wn in the tubes at the mls of drums 2 W1 'cli arcWeller and mud drums each seclicn, which causes a very rapid arccccncclecl by wclcr tubes 3, forming ircc'lal'icn 21ml it is impcs'sibleto drive llic 1:)

ions, each seciiion having a Wuler oil llic heating 'surfacc in sonic 10nd at or near lire lop cf cllier cor; "curious and the steam (aliencling four pcinls of draft ic cut cf upper (Lem cvcr wllcrc film Wale; luplalrcs having acajnslablc returning *0 the lcwer (iii-um which a lways insures dry steam. The lining bricks 18 in the end casings aresecured in pockets cast (in the casings. Thesebricks are made with fiftyper cent. saw dust in the clay when molded, which makes the bestv of n)n-conducting linings. I have found .this lining in conjunction with thedead air space and the asbestos covering with the high furnacetemperature to be only warm on the outside asbestos. v

I protect both the upper drum and the lower druins from the heat of thefurnace by a liningPma-de of two parts fire clay and one part ortlandcement which hardens under heat and which I find is the only practicalway of making a desirable lining in these positions. I boiler must beprotected from the heat of the furnace as they have to. be made so thickfrom two to three inches according to the size of the boiler, to standone thousand pounds or more pressure. Preferably. I would not build forless than six hundred pounds pressure. I prefer eleven hundred pounds asa working pressure'and I prefer to build my drums of asoft cast steel ofnot less than fifty thousand tensile strength and not less than ten percent. elongation. On accountof the high pressure I cannot build my drumsof steel plate riveted together, the usual form of construction. It

is also not easy to roll heavy plates to small diameters which I amnecessarily confined to, a diameter of three feet being about my limit.I can take steel plate heated and pressed to a form to make my drum intwo halves and weld them togetherbut I prefer a soft casting. I coulduse some alloys but I prefer soft steel casting.

I show holes 16 in top of upper drum 1 for taking tubes 3-in and out ofthe boiler. When made in this form the upper drum would be hexagon and Iwould close these holes with brass plugs screwed in, or plates and yokesor other means, or if I did not wish to use this construction I wouldscrew a short nipple in the lower drum then run the remainder of thetube up in the upper drum put a couling on the nipple, screw the longlength c own in said coupling and expand said long end of tube in upperdrum as shown in Fig. 3. Ordinar expansion on a smooth surface would not0 at this pressure. I would cutrecesses with a special 4 tool about onevsixty-fourth of an inch deep in the tube holes in the drum {about fourof these recesses to each inch in thickness and expand the tube eitherby a roller expander or by having a slight taper and use a taper pin,which would be the proper way in very small boilers. In building thisboiler inas small as-from fifty to one hundred H. P. I would make thedrums in two h and bolt them together. Also in s. are from eighteeninches to three in l.

Of course the drums in this seems where the tubeswould be about one totwo feetlong the tubes should only be half inch to three quarters of aninch in diameter and boilers from about four to six feet should be oneinch to an inch and a quarter 111 chameter and from about six to tenfeet they should be from inch and a quarter to inch and shelf indiameter and in boilers from about. ten-to sixteen feet in height theyshould be from inch and a half to two inches in diameter, this beingtin-important factor to produce rapid circulation. If the tubes are toolarge in diameter for the length, the steam globules will rise throu hthe water to the upper drum without producing any circulation, as thesteam globules produce cir culation in this boiler on the same principleas the air globules do in lifting water in wells where the water islifted by compressed air being admitted in a pipe below the water line.

Having described my invention what I claim as new and desire to secureby Letters 'Patent is:

p 1. A steam boiler comprising upper and lower drums connected by watertubes, all

of suitable material and of proper thickness to carry a working pressureof eleven hun dred ounds, all of the tube holes in the upper rum havingfour or more recesses whereby the tubes may be expanded in said recessesto be capable of standing said pres:

sure, the lower ends of said tubes secured to the lower drums, allnecessary parts bein protected from the heat of the furnace'an the watertubes of pro or diameterfor their lengths, whereby per ect circulationisob tained by the application of beat, all sub stantially as set forth.

2. A steam boiler comprising upper and lower drums connected by watertubes, all

of suitable material and. of proper thickness to carry a workin ressureof eleven hundred pounds, all 0 t e tube holes in the "up-- per drumhaving four or more recesses,

whereby the tubes may be ex ended in said recesses to be capable of stuning said was sure, the lower ends of said tubes secured to the lowerdrums, all necessary plartsbeing' protected from the heat of the maceand the water tubes of pro er diameter for their lengths, whereby or setcirculation is obtained b the app ication of heat, and the water tues'covered' on the outside by fire brick containing dead air spacecovered with asbestos and the ends of the furnace having a fire bricklining containing dead air space secured to a casing, said casing beingcovered with asbestos, said furnace containin a brick arch as shown, and'11 takes or dra t exits containing adjustable raft bafiies,'allsubstantially as shown and described and for the purpose set forth.

A steam boiler comprising upper and lower drums connected by watertubes, of

suitable material and proper thickness to carry a working pressure ofeleven hundred pounds, the upper drum hexagon in form, all necessaryparts being protected from the heat of the furnace, and the Water tubesof proper diameter for their lengths, whereby perfect circulation isobtained by the application of heat, all substantially as set forth.

Signed at New York in the county of New York and State of New York this27th day 10 of March A. D. 1909.

E. B. EDGAR, .I. B .'EDGAR.. I

